Complex chromium compounds of monoazo-dyestuffs



Patented Sept. .9, 1952 COMPLEX CHROMIUM COMPOUNDS MONOAZO-DYESTUFFS Willy Widmer, Bottmingen, and Arthur Buehler, Rheinfelden, Switzerland, 'assignors to Ciba Limited, Basel, Switzerland a Swiss firm No Drawing. Application etober3L-1950, Serial 13 Claims. (01. 269-145) This invention relates to the manufacture of valuable new complex chromium compounds. of monoazo-dyestufis, which are free from sulfonic acid groups and carboxyl groups and correspond to the general formula icy],

in whichR indicates a benzene radical which contains in ortho-position to the azo group hydroxyl group.

According to the invention the new compounds are obtained when upon a mixture of different as startin materials and which' containin the radical R of the diazo component a sulfonic acid amide group, there are concerned diazo compounds from ortho-hydroxyaminobenzene sulfonic acid amides. These ortho-hydroxyaminobenzene sulfonic acid amides may be unsubstituted or substituted in the benzene nucleus or on the nitrogen atom of the sulfonic acid amide group. As particularly valuable ortho-hydroxyaminobenzene sulfonic acid amides have proved, for example, the. 6-nitro-2-amino-1-hydroxybenzene l-sulfonic acid amide, the 2-amino-1- hydroxybenzenel-su1fonic acid hydroxyethylamide, the z-amino-l-hydroxybenzene 4 sulfonio acid m'ethylamide', the z-amino-l-hydroxybenzene-E-sulfonic acid amide and the 2-aminol-hydroxybenzene-4-sulfonic acid amide.

The mo'noaZo-dyestufis corresponding to the above formula which are used with the dyestuffs containing sulfonic acid amide groups, for the productionoffthe mixtures serving as starting materials in the present process, can be obtained by coupling ortho-hydroxydiazo-compoundss of the benzene serieswvhich airefree fromsulfonic acid groups, carboxyl groups and sulfonic acid amide groups, with 1-acylamino-7-hydroxynaphcompounds of such-ortho hydroxyamines of the benzene series, the benzene nuclei of which con- In Switzerland November 18,

2 tain in addition to the hydroxyl and amin group also further substituents suchas halogen. atoms (for example, chlorine), alkyl groups (for example, methyl)l, alkoxy, groups (for example, methoxy), nitro-groups, -CO-alkyl groups (for example, CO--CH3), sulfone groups (for. example -SOz-'CI:I3),or acylamino groups (for example, acetylamino). Valuable results are produced from the following ortho-hydroxyamines: 4-methyl 2 amino l-hydroxybenzene, Q-methoxy-Z-amino-lq-hydroxybenzene, 4-chloro- 2-amino -1-hydroxybenzene, 4 6dich1oro-2-amino-l-hydroxybenzene, *l-nitro-Z-amino 1 -.hydroxybenzene, 5-nitro-2-amino ,1 hydroxybenzene, 6-nitro-l-methy1-2-amino-l-hydroxybenzene, fi-acetylamino 4 chloro-Z-amino-l-hydroxybenzene, 5nitro-l-ch1oroe2-amino l hydroxybenzene, l-nitto-G-chloro-Z-amind -,,1 hydroxybenzene, 4:6-dinitro-2-amino-1 hydroxy benzene, .finitrol-chloro-z-amino l-hydroxybenzene, 4-nitro6-acetylamino-2 amino-l-hydroxybenzene, 3-amino-4-hydroxy-acetophenone, 5-nitro-3-amirlo 4 hydroxy acetophenonazamino 1 hydrox-ybenzene 4 carboxylic acid amide.

. "l he lacylamino-7-hydroxynaphthalenes serving as coupling components in the production of the monoazo-dyestuffs contain n further substituents in the naphthalene nucleus. The 'acyl radicals of these compounds, apart from the fact that they must be free from sulfonic acid groups and. carboxylgroupsmay have any suitableconstitution. Advantageously such l-acylamino 'lhydroxymaphthalenes are selected of which the acyl radical is simply constituted, forexample contains only the elements C, H and O and contains at the most six carbon atoms and two oxygen atoms. Such acyl radicals are for example those of the general formula known per se, preferably; in an alkaline medium,

for example a medium; alkaline-with alkali carbonate or alkali hydroxide.

When the coupling reaction is complete the dyestuffs can easily be separated from the coupling mixture by filtering off, since owing to the fact that they contain no solubilizing groups they are only of low solubility in water. They areadvantageously used for the chroming; as a filtercake without intermediate drying. The mixtures of monoazo dyestuiis to be chromed canv be obtained by mixing two or more thantwo separately prepared monoazo dyestuffs. They can also be obtained by simultaneously coupling one molecule of ortho hydroxydiazo benzene sul-fonic acid amide and one molecule of an ortho-hydroxydiazobenzene which is free from sulionlc acid amide groups with two molecules of a 1.-acylamino-7-hydroxynapthalene.

The monoazo-dyestuff's obtainable according to the above directions" and serving as starting materials for the present process are in part new. In general even as alkali compounds they are not particularly easily soluble in water;

According to the present process the treatment with the agents providing chromium takes place in such a manner that a complex chromium compound is produced which. contains at least two different monoazo dyestuffs and less than one atom of chromium per molecule of mono'azo dyestufi; Accordingly the chroming is suitably carried outwith-such: agents providingchromium and according to such methods as, in accordance with experience, produce. complex chromium compounds or this constitution. It is to be recommended in general to use for two molecules of dyestuff less than two atoms of chromium and/or to carry out the chroming in a weakly acid or alkaline medium, Accordingly those chromium compounds which are stable in an alkaline medium are also especially well suited to the carrying out of the process, as for example such chromium compounds of aliphatic hydroxycarboxylic acids or preferably aromatic orthohydroxycarboxylic acids, as contain the chromium in complex combination. As examples of aliphatic hydroxycarboxylic acids there may be mentioned among others lactic acid, glycollic acid, citric acid and especially tartaric acid, while among the aromatic ortho-hydroxyc'arboxylic acids there should be-mentioned for example such of the benzene series, for example 4-, 5- 01'6- methyl-1-hydroxybenzene-2-carboxylic acid and primarily the l-hydroxybenzene 2 ca'rboxylic acid which is not further substituted.

The conversion of the dyestuffs into the complex'chromium compounds takes place withadL- vantage in the hot, with or without pressure, for example at the boiling temperature of the reaction mixture, if desired in the presence of suitable additions, for example in the presence of salts of organic" acids, of. bases, organic solvents or other media which promote the complex formation.

As an example a mixture of two different or a mixture of more than-two differentdyestufis of the general formula set forth above, one of which contains in the radical R a sulfonamide group, for example a mixture of the two dyestuffsv 'OgNHr CO GH} and 4 on on:

, HN (I117 (JO-CH3 or of the three dyestuffs on on HN- OZNHZ (IO-CH3 No, (Lo-0H3- and on on HN CONE; lOOHa may be subjected toa chroming process as described above, whereby mixed complexes are produced in which for the most part differing dyestuffs, for example such containing sulfonamide groups-and such as are free from sulfonamide groups, are attached together by a chromium atom.

The dyestuils obtainable according to the present process can also be produced according to a modification of this process wherein chro mium compounds of monoazo-dyestufls containing one atom ofcomplex combined chromium per" molecule of dyestuff (lzl-complexes) arereacted with monoazo-dyestuffs free from chromium, in whichcase monoazo-dyestufls which are free from chromium and which contain chromium (kl-complexes) are used which are free from-sulfonic" acid groups and carboxyl groups and correspond to the general formula in whichv Rindicates an aromatic radical or the benzene" series which contains a hydroxyl group in ortho-position to the azo group and in which also either! the monoazo dyestufisiree from chromium or those containing chromium, contain also a sul'fonic acid amide group in the radi- 5 in which It indicates a benzene radical which contains a hydroxyl group in ortho-position to the azo group, one of these monoazo dyestuffs containing in the radical R a sulfonic acid amide group. a r

The new dyestuffs containing chromium are soluble in water and in fact of better solubility than the starting dyestuffs free from metal which are used in their manufacture. They are suitable for the dyeing and printing of-a wide variety; of materials, but principally for the dyeing. of animal materials such as silk, leather and especially wool and synthetic fibers from superpolyamides and superpolyurethanes. In contradistinction to the chromium compounds of dyestuffs containing sulfonic acid groups, with which it is advantageous to dye from a strong acid, for example sulfuric acid,- bath, these new chromium compounds of monoazo-dyestuffs which are free from sulfonic acid groups are primarily suited to dyeing from neutral to weakly acid baths. Wool dyeings obtainable in this manner are distinguished by good uniformity, good wet fastness properties and very good fastness to light.

The following examples illustrate the invention, the parts and percentages being by weight unless otherwise stated and the relation between parts by weight and parts by volume being the same as that betwen the kilogram and the liter:

Example 1 18.8 parts of Z-amino-l-hydroxybenzene-4=- sulfonlc acid amide are suspended in 200 parts of water and 15 parts by volume of ION-hydrochloric acid and diazotized at 5-10 C. with 25 parts by volume of 4-.N-sodium nitrite solution. The diazo compound, neutralized by addition of sodium carbonate, is allowed to flow into a solution cooled with ice to C. of 20.5 parts of lacetylamino-7-hydroxynaphthalene in 52 parts by volume of ZN-sodium hydroxide solution and 50 parts by volume of 2N-sodium carbonate solution. When the coupling is complete the separated dyestuff is filtered and washed with dilute sodium chloride solution. When dry it constitutes a brown-black powder which dissolves in hot water with a violet and in concentrated sulfuric acid with a pure red color. The dyestuff dyes wool by the single bath chroming process in fast grey shades.

If in the above example instead of 18.8 parts r of Z-amino-1-hydroxybenzene-4-sulfonic acid amide, 23.3 parts of 6-nitro-2-amino-1-hydroxybenzene-i-sulfonic acid amide are used, a dyestuif of similar properties is obtained which dyes wool somewhat more violet shades.

By using instead of the 20.5 arts of l-acetylamino-'7-hydroxynaphthalene, 22.9 parts-of l-n- 6 butyryl-amino-7-hydroxynaphthalene, a dyestuff which is likewise of similar properties is obtained.

Example 2 18.8 parts of 2-amino-1-hydroxybenzene-5-sulfonic acid amide are suspended in 200 parts of water and 15 parts by volume of ION-hydrochloric acid and diazotized at 5-l0 C. with 25 parts by volume of iN-sodium nitrite solution.

The diazo compound, neutralized byaddition of 1 sodium carbonate, is allowed to flow into a solution cooled with ice to 0 C. of 20.5 parts of 1- acetylamino-7-hydroxynaphthalene in 52 parts by volume of 2N-sodium hydroxide solution and parts by volume of 2N-sodium carbonate solution. When the coupling is complete the separated dyestuff is filtered and washed with dilute sodium chloride solution. When dry it forms a black powder which dissolves in hot water with a blue and in concentrated sulfuric acid with a violet color. The dyestufi dyes wool by the single bath chroming process in fast grey-blue shades.

Example 3 40 parts of the dyestuff obtained according to Example 1, paragraph 1, and 35.5 parts of the dyestuif obtained by known methods from 4- chloro-2-amino-1-hydroxybenzene and l-acetyl- Hamino-7-hydroxynaphthalene, are suspended in 3000 parts of water and treated with 220 parts of a solution of sodium chromsalicylate with a chromium content of 2.6 per cent. After 6 hours boiling under a reflux condenser the chroming is completed. The chromium compound obtained is separated by addition of sodium chloride and filtered off. When dried it constitutes a'black powder which dissolves in water with a grey-blue and in concentrated sulfuric acid with a red color and dyes wool both from a neutral and also from an acetic acid bath in uniform grey-blue shades of excellent fastness to light.

The dark green solution of sodium chromsalicylate is obtained by boiling 362 parts of an aqueous chromic sulfate solution with a chromium content of 7.2 per cent. with 138 parts of salicylic acid, dissolving the chromsalicylic acid produced by addition of so much 30 per cent. sodium hydroxide solution that a distinct alkaline reaction to phenolphthalein is produced and making up with water to 1000 parts.

Dyestuffs of similar properties are obtained when the monoazo dyestuffs mentioned in the above example are replaced by those in the following table and the process is carried out in an analogous manner. In the columns A and B are set out the two ortho:ortho'-dihydroxymonoazodyestufis which are in complex combination with the chromium.

Color Wool dyeing A B from an acetic of the of the soaqueous lution in mm bath solution cone. E

4.0 parts 41. 3 parts 5 11 blue pink blue grey.

-N=N- CH: C O-NH -N=N NH- HN l1 0 OH: 0 O CH:

5 OQNH] Color 'wooldyelng A B Iromanacetic of the of the soueous lutlonin bath so ution cone. H 80 40 parts 38 parts ([)H OH H OH OH blue.-- pink bluegrey.

--N=N OzN- =N- HN HT- loom Ha (10cm ozNHg :10 parts 36. 6 parts OH OH blue red violet grey.

HIV- OONH: COOH:

36.6parts OH OH blue pink grey.

NH- $0 NO: J

41. 2 parts 35. 5 parts OH' OH OH OH grey blue. red grey blue.

, -N=N N=N N'H-- NH- sa) NH 1 0 2 I Hr-OH zCHz H:

41. 2 parts 36. 6 parts (|)H OH OH OH zreenblue. red grey.-

NH NH- s6 NH O NO ('30 2 l 2 Hg-oHzom (SH:

40 parts 38. 4 parts OH OH OH OH grey blue.. red grey.

T N 56M 5 1 $0 I (gH V HrCHz-CH:

siwrtw 4 7 OH OH green blue. red. grey.

HrCHr-CHa V 11 Example4 26.7 parts of the dyestuff obtained acdording to Example 1, paragraph'l 23.7 parts of the dyestuff obtainable from 4- c hloro-2-amino-1- hydroxybenzene and l-acet-ylami-no-7-hydroxynaphthalene and 24.3 parts of the dyestuff obtainable from 2-arnino l-hydroxybenzenel-carboxylic acid amide andf'l a'cetylaminofl-hw droxynaphthalene are suspended in 3000 parts of water and treated with 220 parts of a solution of sodium chromsalicylate with a chromium content of 2.6 per cent. After boiling for 6 hours under a reflux condenser the chroming is complete. The chromium compound obtained is separated by addition of sodium chloride and filtered off. It forms when dry a black powder which dissolves in water with a grey-blue and in concentrated sulfuric acid with a red color and which dyes W001 both from a neutral and also from an acetic acid bath in uniform greyblue shades of excellent fastness to light.

When in the above example instead of the dyestuff from 4-chloro-2-amino-l-hydroxybenzone and 1-acetylamino-'7-hydroxynaphthalene, 24.4 parts of the dyestuff obtainable from -nitro- 2-amino-1-hydroxybenzene and l-acetylamino- 7-hydroxynaphthalene are used, a chromium compound is obtained of similar properties which dyes wool in uniform greenish-grey shades.

Example 0.5 part of the dyestuif containing chromium obtainable according to Example 3, paragraph 1, is dissolved in 4000 parts of water, 10 parts of crystalline sodium sulfate are added and 100 parts of well wetted wool are entered at 40-50 C. into the dyebath thus obtained. Then 3 parts of 40 per cent acetic acid are added, the whole brought to the boil within /2 hour and dyed at the boil for hour. Finally thewool is rinsed with cold water and dried. A uniform grey-blue dyeing is obtained of good fastness to washin and outstanding fastness to light.

A uniform grey-blue dyeing of good fastness to washing and outstanding fastness to light is likewise obtained by proceeding according to the directions of this example but without adding acetic acid to the dyebath.

What is claimed is:

1. A chromium compound which contains at least two different monoazo-dyestuffs in a complex in which the proportion of the number of chromium atoms in complex combination to the number of monoazo-dyestuff molecules is less than 1:1, each of the monoazo-dyestufis present in the complex being free from sulfonic acid groups and carboxyl groups and corresponding to the general formula monoazo-dyestuff molecules is less than 1:1, each of the monoazo-dyestuifs present in the complex being free from sulfonic acid groups and carboxyl groups and corresponding to the general formula in which R indicates a benzene i'adical which in. which R represents a benzene radical contains a hydroxyl group in ortho-position to theazo-group, and the other'monoazo-dyes'tufi also present in the complex corresponding 'to the formula n; on

in which one of the ars represents the -SO2NH2 group, the other standing for hydrogen, and n represents a whole number up to 5.

4. A chromium compound which contains two different monoaz o-dyestuffs which are free from sulfonic acid groups and carboxyl groups mt complex in which the proportion of the number of chromium atoms in complex combination to the numbereof monoazo-dyestuff molecules is about 1: 2, one of the monoazc=dyestuffs present in the complex corresponding to the formula,

inwhich it represents a whole number unto .5, 2

represents a member selected'ffdin the class consisting of hydrogen, halogen, nitro and acyla m'ino 2. A chromium compound which contains two, 1

different monoazo-dyestuffs in a complex in which the proportion of the number of chromium atoms in complex combination to the number of groups, one of the ys represents a hydrogen atom and the other stands for a member selected from the class consisting of hydrogen, halogen, methyl and nitro groups, and the other monoazo-dye- '13 stuff also present in the complex corresponding to the formula and the other monoazo-dyestuflf also present in the complex corresponding to the formula (RH OH in which one of the :cs represents the -SO2-NH2 group, the other standing for hydrogen, and n represents a whole number up to 5.

6. A chromium compound which contains two different monoazo-dyestufis which are free from sulfonic acid groups and carboxyl groups in a complex in which the proportion of the number of chromium atoms in complex combination to the number of monoazo-dyestuif molecules is about 1:2, one of the monoazo-dyestufis present in the complex corresponding to the formula and the other monoazo-dyestufi also present in the complex corresponding to the formula in which one of the :cs represents the -SO2-NH2 group, the other standing for hydrogen, and n represents a whole number up to 5.

7. A chromium compound which contains two different monoazo-dyestufis which are free from sulfonic acid groups and carboxyl groups in a complex in which the proportion of the number of chromium atoms in complex combination to the number of monoazo-dyestufi molecules is 14 about 1:2, one of the monoazo-dyestufis present in the complex corresponding to the formula on OH v N=N and the other monoazo dyestufi also present in the complex corresponding to the formula in which one of the ws represents the SO2NH2 group, the other standing for hydrogen, and n represents a whole number up to 5.

8. A chromium compound which contains two different monoazo-dyestufi which are free from sulfonic acid groups and carboxyl groups in a complex in which the proportion of the number of chromium atoms in complex combination to the number of monoazio-dyestuff molecules is about 1:2, one of the monoazo-dyestuffs present in the complex corresponding to the formula OH OH 01 :0 O-NH- N=N an 1 i and the other monoaao dyestuflz also present in the complex corresponding to the formula in which one of the xs represents the -S02-NH2 roup, the other standing for hydrogen, and n represents .a whole number up to 5.

9. The chromium compound which contains two different monoazo-dyestufis in a complex in which the proportion of the number of chromium atoms in complex combination to the number of monoazo-dyestuff molecules is about 1:2, one of the monoazo-dyestuffs present in the complex corresponding to the formula and the other corresponding to the formula OH OH 10.. II'lie chromium compound which contains two different monoaZo-dyestuffs in a complex in which the proportion of the number of chromium atoms in complex combination to the number of monoazo-dyestufi molecules is about 1:2, one of the monoazo -djiestufis present .in the complex correspondingto the formula,

G g -CH3 and the other corresponding to the formula 1 1. The chromium compound which *contaln's two different imonoazo idyestuifs :in 1a, complex in which the proportion of the number of :chr'omium atoms in complex combination to the number of mono'azo-dyestufi molecules is about 1:2, one of the monoazo-dyestulf's presentrin the complex correspondingijto the formula and. the other corresponding to the formula.

v12. The "chromium compound which contains "two different "momma-dyestuffs in a complex in which the proportion of "the number of chromium "atoms'in complex combination-tome numberof 'monoazo-"dyes'tuff molecules is about -1-: 2,"-o'neof 1c, the 'monoazo-dyestuifs present 'inpthe complex corresponding to the formula 13. The chromium compound which contains two different monoazo-dyestuffs in a, complex in which the proportion of the number of chromium atoms in complex combination to the number of monoazo-dyestufl molecules is about 1:2, one of the IIIOIlOfiZO-dYGStllfis present in the complex corresponding to the formula and the other corresponding to the formula OH OH ARTHUR BUEHLER.

EREFERENC'ES CITED The folloirling references are'of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,325,841 Fritzsche Dec. 23, 1919 1,835,821 -Straub et al Dec. 8, 1931 1,925,434 icling-estein et a1. .Sept. 5, 1933 1,989,569 Straub et a1 Jan. 29, 1935 

13. THE CHROMIUM COMPOUND WHICH CONTAINS TWO DIFFERENT MONOAZO-DYESTUFFS IN A COMPLEX IN WHICH THE PROPORTION OF THE NUMBER OF CHROMIUM ATOMS IN COMPLEX COMBINATION TO THE NUMBER OF MONOAZO-DYESTUFF MOLECULES IS ABOUT 1:2, ONE OF THE MONOAZO-DYESTUFFS PRESENT IN THE COMPLEX CORRESPONDING TO THE FORMULA 